| ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 07876 | Image Enhancement | Minor | Always | 9 days ago | 9 days ago |
| Tester | ICEknight | View Status | Public | Platform | MAME (Official Binary) |
| Assigned To | Resolution | Open | OS | Windows 10 (64-bit) | |
| Status [?] | Acknowledged | Driver | megadriv.cpp | ||
| Version | 0.228 | Fixed in Version | Build | 64-bit | |
| Fixed in Git Commit | Github Pull Request # | ||||
| Summary |
 07876: genesis and clones: NTSC inaccuracies with HLSL (bgfx) |
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| Description |
Trying to get HLSL's NTSC emulation to look like my Genesis Nomad and Japanese Mega Drive's composite output, I noticed that the "rainbow effect" looks more saturated than real hardware and its position seems to be a bit shifted (which might be related to https://mametesters.org/view.php?id=6892 ?). Best game for testing has to be Zero Tolerance, which shows some (accidental?) "holographic foil" effect on the title screen when using composite NTSC video (the effect isn't visible over RGB or on PAL systems). |
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| Steps To Reproduce |
-First load zerotol under the Genesis or Mega Drive system, using -video bgfx -Then, in order to get clean screenshots comparable to what you'd get on real hardware captures, configure HLSL like this: ----Effect: hlsl ----Shadow Mask: white ----Enable NTSC: On ----NTSC A Value: 0.00 ----NTSC B Value: 0.00 ----Scanline Duration (uSec): 47.7 ----Phosphor Persistence, Red: 0.00 ----Phosphor Persistence, Green: 0.00 ----Phosphor Persistence, Blue: 0.00 ----Scanline Amount: 0.00 -Then just wait for a bit for the title screen to show up. |
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| Additional Information |
I'm including direct video captures with both a generic Scart to HDMI adapter and an OSSC, for reference (aspect ratio with the generic adapter was manually adjusted in OBS, so OSSC's is likely more accurate): Genesis Nomad, composite, captured with generic Scart to HDMI: Genesis Nomad, RGB, captured with generic Scart to HDMI: Genesis Nomad, RGB, captured with OSSC: Mega Drive PAL, composite, captured with generic Scart to HDMI: Mega Drive PAL, RGB, captured with OSSC: |
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| Github Commit | |||||
| Flags | Verified with Original | ||||
| Regression Version | |||||
| Affected Sets / Systems | genesis and clones | ||||
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Attached Files
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MAME HLSL (scanline duration 47.7)
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Genesis Nomad, composite, captured with generic Scart to HDMI (cropped)
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Genesis Nomad, composite, captured with generic Scart to HDMI (full) | |||||
